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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33d32a5eaca2493ec6f2cb4f2357ff6e85d77621eea5e8aa78ba3481be65665e' 
  AND token = '6HSavJJUHh2tC7T4f4mrUNxfsbXoVZTWt/QqZ1YFO5w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}